13. The males of many animal species signal their fitness to females by displays

Question

13. The males of many animal species signal their fitness to females by displays of various kinds. For male barn swallows, the signal is the color of their plamage, Does better color realy lead te more offspring? A randomized comparative experiment assigned barn swailow pairs who had already produced a clutch of eggs to three groups: 15 males had their color "erhanced" by the investigators, 10 were handled but their color was left alone, and 8 were not touched. DNA testing showed whether the eggs were sired by the male of the pair rather than by another male. Tecondl brcod, and maies n the other welons usually prodce s recond brood in sueh creumstances, Sure enough, the males with enhanced color fothered more young in the groups fathered fewer. The investigators used ANOVA to compare the three groups. The degrees of freedom for the F statistic that compares the numbers of the male's own young among the epgs in the first brood are (in incressing order) an The statistic was F-0.07. What can you say about the P-value? P> s in the number of the male's own young between the first and second broods Of the 33 original pairs, 31 produced a second brood. The degrees of freedom for F to compare produced by these 31 pairs are (in increasing order) and The statistis was F-4.88 hat is the range for the P-value from Table o Chack Syntax Syntax ok Remaining: 6:09:00 Start: 5:27 PM

Explanation / Answer

Result:

Total sample size = 15+10+8=33

Number of groups = 3

Df1=3-1=2

Df2=33-3=30

Degrees of freedom are 2 and 30

When F=0.07, P >0.05

For the second blood,

Degrees of freedom are 2 and 28

When F=4.88,      0.01<P< 0.05

Related Questions

Navigate

• Browse (All)
• Browse 1
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.